Once Upon a Slime

About this game

Once Upon a Slime is the first game that I am making in my career of a game developer and is an arenashooter / Bossbeater game about a little slime.

At the moment there are 3 gamemodes in development:

- Endless / Survival Mode
- Story Mode
- Pacifist Mode

Endless / Survival Mode will throw you in an arena with an infinite spawning number of enemies. Shoot enough of these enemies and you will level up, making you able to pick new weapons, abilities or upgrades. There is also a store in this gamemode in which you can buy certain skill upgrades or new special weapons.

Story Mode will take you on an adventure in which you need to progress through levels and beat a couple bosses along the way!

Pacifist Mode also throws you in an arena with spawning waves of enemies except you are not able to shoot any enemies! make sure to dodge al those scary slimes by using the dash ability!

Controls

- AWSD or arrow keys to move your hero!
- Left click to shoot
- Right click to dash

Latest news

• Announcements·3 Jun 2025Official

  Once Upon a Slime Playtest available now!

  World 2 - New areas with themed decorations - New enemies - New hazards - 3 New bosses 😯 While exploring world one and these new areas make sure to look out for secret notes left by a previous explorer. Try to collect them all to get more insight at what happened in this hidden dungeon. Once collected, view them in the collectables tab in the ingame menu. When you are there, also make sure to take a look at the Jiggly journal where you write down some notes on the enemies you have beaten! Next to a new world, here are some more additions! I haven't been sitting still! - New looks for all characters and bosses - New and improved settingsmenu - New and improved pause menu to support al the new features - New dialogue system (conversations and player thoughts) 💬 - New healing system, check the keybinds 🩹 - Added Controller Support! Now play the game using your gamepad 🎮 For the gamers who have played the demo and recalled the old functionality of collecting a certain amount of keys to unlock a door, remove this from your brain and welcome the new keys system! All doors now require only one key and once used these keys will break... To protect game progression world 2 is locked till the player beats both bosses in the first area and gathers both parts of a medallion! PS: the demo will be taken offline to perform long needed updates as it no longer correctly represents the full game! CHANGES - Improved the saving and loading of playersaves 💾 - Improved Settings saving and loading 💾 - Improved audio systems 🎶 - Improved player animations - Improved spawning system (more variation) - Improved the enemy AI! The enemy now retreats when the player is in unreachable areas! - Changed some hazard locations to be more forgiving
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• Announcements·16 Mar 2025Official

  Once upon a Slime DEMO

  PATCH NOTES 0.3.1.4 Good news! I-frames are here to stay! This mechanic gives you the ability to take a small 0.5 second breather after being hit! This version also brings a rework of the knock-back system and the yellow slime! To finish it of, say welcome to the introduction of key bindings! Patch 0.3.1.4 brings all the above and more! ADDITIONS - Added settings for key bindings - Added randomness to the pitch height of bullets. - Added an idle animation for the player. - Added sound effect for testing SFX volume. CHANGES - Changed Spawn and Death color system. - Changed the navigation system. - Changed the settings saving system. - Changed the brainwave bullet speed for General Goodboy. - General Goodboy brainwave indication now shows up 1 second before the attack commences. - Removed the invincibility state for General Goodboy in between phases. - Walls are now more transparent. - Some holes have been moved and all holes are now bigger. - Locks for permanently closed doors no longer show a value. - Reworked the knock-back system, all knock-backs now happen based on the contact position instead of the center of an enemy or spike. Spike loops are even more deadly but all knock-backs will seem more realistic now! - Changed the mechanics of the yellow slime to make these slimes more threatening. FIXES - Fixed a bug where doors to bosses were behaving strangely. - Fixed a bug where on the first boot of the game the music is turned all the way down. - Fixed a bug where the black slimes can not fit through tight gaps together. - Fixed a bug where General Goodboy sometimes did no damage during his dash attack.
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• Announcements·25 Feb 2025Official

  Once upon a Slime DEMO

  PATCH NOTES 0.3.1.3 Version 0.3.1.3 contains a new experimental feature that may or may not end up in the game! I Would love to hear your opinions about the new I-frames feature! ADDITIONS - Added I-frames (invincibility-frames). When the player is red he will be invincible against any attacks. ATTENTION: This addition is Experimental and may or may not end up in the final game! CHANGES - Added 1 name to the credits and corrected spelling errors. - Pressing escape now opens AND CLOSES the pausing menu. - FPS limiter has changed form a dropdown menu to a Slider. - Changed saved slimepool color to the same color as the player. FIXES - Fixed bug where the difficulty buttons were clickable above the button itself. - Fixed a bug where a player is forced to stay still for a short time after dashing in place. - Fixed a bug where a player would move out of a hole while ending a dash in a hole. - Fixed a bug where after dying the pausemenu couldn't be brought back up.
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• Announcements·16 Feb 2025Official

  Once upon a Slime DEMO

  PATCH NOTES 0.3.1.2 Since bug-reports are becoming fewer and fewer, DEMO updates will now become more irregular and will reduce in size. Any feedback and bug reports will be considered towards the full game, but it may take some while before they will be implemented in the DEMO so development towards the full game can strive! This time is being used for completing world 2 which I will probably make available in the discord for verified playtesters once it will be done! CHANGES - Added more names to the credits! Thanks for playtesting! - Minor changes to text on the signs inside the tutorial part. - Minor change to dropdownmenu's, they no longer fade in or out. - Changes to the navigational system, slimes will reach you in more spots now! - Moved the bark sound to a new spot.
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• Announcements·13 Feb 2025Official

  Once upon a Slime DEMO

  PATCH NOTES 0.3.1.1 Streamer Cerius Lawliet attempted this demo during one of his streams. Through his and other playtester's greeaet feedback these changes have been added in version 0.3.1.1! Follow Cerius Lawliet on twitch through the following link! https://www.twitch.tv/cerius_lawliet/ GENERAL CHANGES - Added offset to spawning bullets in the General Goodboy boss battle to increase fairness during these attacks. - Increased bullet speeds for General Goodboy's ranged attacks due to new offset rules. - Decreased size of spike colliders so it will no longer seem as if the player didn't get hit by them. - Moved one of the holes before arriving to General Goodboy so it will no longer look like the player gets hit to the right but will now get stuck in the right hole. - Changing some sprites to the correct layer to prevent false overlapping. - Door will now stay permanently open after beating a boss once. - Improved Spawn and Death animation for slimes. Animation Colors now match the slime colors. - Changed pausing to the Escape button instead of an ingame button. CHANGES GENERAL GOODBOY PHASE 3 - Removed General Goodboy's hat in phase 3 due to unexpected physics behaviour. - Increased the firerate from 1 bullet per 1 second to 1 bullet per 0.8 seconds for the blue attack. - Decreased the firerate from 1 bullet per 1 second to 1 bullet per 1.3 seconds for the purple attack. - Decreased the speed from 14 to 12 for the red attack.
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